#1. we inhale oxygen and exhale carbon dioxide as a result of a change in our bodies.
a. physical/ b. chemical
#2. select the best answer from the choices provided
a which of the following is an example of a chemical change?
a. ice melting/b. pounding gold into a coin/ c. milk souring/d. a puddle of water evaporating
#3. select the best answer from the choices provided
which of the following is an example of a physical change?
a. dissolving salt in water./ b. cooking an egg./c. burning wood into charcoal./d. rusting iron.
#4. what kind of chemical change involves breaking down substances using electricity?
a. electrothermic/ b. electrolysis /c. exothermic /d. electrodecomp
#5. which of the following is an example of a chemical change?
a. ice melting/ b. milk souring/ c. pounding gold into a coin/ d. a puddle of water evaporating
#6. which of the following is an example of a physical change?
a. dissolving salt in water./b. burning wood into charcoal./c. cooking an egg./d. rusting iron.
#7. what kind of chemical change involves breaking down substances using electricity?
a. electrothermic/ b. exothermic/c. electrolysis/ d. electrodecomp
#8. what chemical change occurs when a more reactive substance replaces a less reactive substance in a compound?
a. oxidative/ b. displacement/c. reduction/ d. endothermic